Combination power hand tool



NOV- 22, 1966 E. M. RlcHlsoN ETAL. 3,286,775

COMBINATION POWER HAND TOOL NOV- 22, 1966 E. M. RlcHlsoN ETAL 3,286,776

COMBNATION POWER HAND TOOL 2 Sheets-Sheet 2 Filed June 23, 1964 iUnitedStates Patent C 3,286,776 COMBINATION POWER HAND TOOL Eugene M. Richisonand Ethel M. Richison, Kinta, Okla., assignors of one-half to KennethConklin and T. H. Conklin, jointly, both of Stigler, Okla.

Filed June 23, 1964, Ser. No. 377,253 17 Claims. (Cl. 173-48) Thisinvention relates to a combination power hand tool adapted to performseparately a plurality of different operations. l j

The primary object of the invention is the provision of a more compact,better-balanced, more efficient, and more easily used tool of the kindindi-cated, wherein, in the successive `performance of several differentoperati-ons, it is not necessary lto detach the various working elementsor accessories involved.`

Another object of the invention is the provision of a tool of thecharacter indicated above, whi-ch is'adapted to impart rotary motion toone or more of the accessories involved at any time, and reciprocatingmotion to the other accessories. l

A further object of the invention is the provision, in a tool of thecharacter indicated above, 'of simpler, more eflicient, and more easilyoperated manual clutch means for operatively connecting anddisconnecting the different accessories.

In the drawings:

FIGURE l is a contracted top plan view, partly broken away and insection, of a tool of the present invention, showing the clutch of oneof two opposed rotary chuck shafts engaged, and the clutch of the thirdor reciprocating shaft disengaged, working elements being shown engagedin the chucks and secured to the reciprocating shaft;

FIGURE 2 is a contracted side elevation of the tool, partly broken awayand in section;

FIGURE 3 is a transverse vertical section takenon the line 3 3 of FIGURE2; j

FIGURE 4 is a transverse vertical section taken on the line 4-4 ofFIGURE 2;

I FIGURE 5 is an enlarged inner end elevation of a cam wheel, taken onthe line 5-5 of FIGURE 2;

` FIGURE 6 is an enlarged transverse vertical section taken on the line6-6 of FIGURE 2;

FIGURE 7 is a perspective view of a hacksaw acces- SOry;

FIGURE 8 `is a perspective view of a reciprocating sander accessory;and,

FIGURE 9 is a perspective view of a buffer accessory.

Referring in detail to the drawings, and iirst to FIG- URES l t-o 6thereof, the illustrated tool comprises a longitudinally elongatedsubstantially cylindrical hollow casing 12, which, at its rear end isgradually reduced in diameter, as indicated at 14, to merge into ahollow, axial handle 16, having an enlarged annular knob 18, on its rearend. The casing 12 has an open forward end 20, around which is aninternal annular sh-oulder 22, providedwith circumferentially spacedthreaded bores 24.

'Adjacent to the rear end 20, the casing 12 is formed with a pair ofparallel spaced external ribs 26, which dene a relatively wide flatgroove 28, in which is conned a side handle carrying band 30. The band30 is formed with a radial threaded bore 31 which receives an axialreduced diameter stud 32 on the inner end of a knob handle 34. Asindicated by arrows in FIGURE 3, adjustment of the position of thehandle 34, around the casing 12, suite-d to operations being performed,is readily obtained, merely by backing out the handle st-ud 32 androtating the band, after which the stud 32 is tightened against thebottom of the groove 28 to hold the adjustment.

As shown in FIGURE 1, a spider 36 extends across 3,286,776 Patented Nov.22, 1966 ice the rear end of the casing 12 and carries `a hub 38 whichis formed with a blind bore 40, axial relative to the casing, in whichis suitably secured a tubular rear motor shaft bearing 42. A lubricantpassage 44 leads to the bearing 42 from the exteriorrof the casing.

An electric motor shaft 46 has a rear end portion 48 engaged in the rearbearing 42, and extends forwardly through a forward bearing 48 which issuitably secured through the hub 50 of a removable disc web 52, whichengages and closes the forward end 20 of the casing. The shaft 46carries a cooling fan 54 located at the rear side of the web 52. Therear end of the casing 12 is formed with air inlet -openings 56, and theweb 52 is formed with outlet openings 58, which lead from the rear sideof the web to the rim of the web.

The motor shaft 46 has, adjacent to its rear end, a commutator 60, whichi-s contacted by c-ommutator contacts 62, which are mounted on thesidewall 64 of the casing 12. Rotor windings 66 are fixed to andsurround the shaft 46, forwardly of thecommutator `60, and thesewindings are in Vturn surrounded by eld windings 68, fixed lon thesidewall 64.`

As shown in FIGURE 2, the forward bearing carrying web 52 is of the sameoutside diameter as the forward end 20 o-f the casing 12, and has,spaced from its perimeter, an annular flange 70, which seats in anannular groove 72, formed in the shoulder 22. The web 52 has smoothbores 74 which register with the threaded bores 24 of the shoulder 22.The forward side of the web 52 is formed with an annular ange 76, spacedinwardly, from the perimeter, which defines with the forward side of theweb, a groove 78, in which seats the rear end of a rear gear hou-sing80. As indicated in FIGURES 1, 2, and 4, the sidewall 82 of reargearhousing 80 has `a V-shaped extension 84 at the bottom thereof, andhas a downwardly and forwardly angled upper part 86, to the forward endsof which are fixed a forward end wall 88.

The part -of the motor shaft 46 which extends forwardly across the reargear housing is formed with worm threads 90, which are in mesh with anenlarged diameter speed-reducing worm wheel 92, located below the shaft46, in the V-shaped extension 84 and fixed on a shaft 94.

As shown in FIGURE 2, the reducing gear shaft 94 is jofurrraled, at itsrear end, .in a bearing 96, on the .forward side of the web 52, with :aball bearing 98 ciroumposerl on the shaft l94 between the lbearing 96and the rear side of the worrn wheel 92. The worm wheel Shaft 94 isprovided with a forwardly extending splined portion '100, which isnon-rotatably engaged in a splined socket 102, formed in the rear end ofa longitudinal gear shaft 104. A tubular bearing 10:6 is suitablysecured in a bore 108 formed through the forwand end wall `80 of therear gear housing 80 which receives the sh'aft 104. A disc bearing l110is interposed between the forward side of the worm. wheel 92 and therear side of the w'all 88.

The longitudinal gear shaft 104 has its rear end engalged in the bearing106, and extends forwardly therefrom part-way through a forward gearhousing 112. The forward gear housing is smaller in diameter than and isdownwardly offset, relative to the top of the rear gear housing 80. Therear gear housing 80 is formed with smooth bores 114, which registerwith the bores 74 of the web 52, and bolts 116 extend through thesebores and are threaded into the threaded bores 24 of the casing 12, soas to assemble the web 'and the rear gear housing to the casing.

The lower part of the sidewall 1.18 of the forward gear housing 112conforms in shape to the lower part of the sidewall of the rear gearhousing 80, and has a top wall portion 120` which is spaced .below thetop of the rear gear housing 80 and slants downwardly and forwardlyrelative thereto, to join with a reduced diameter forward end wall 122.

The forward gear housing 112 has, on its rear end, a surrounding lateralfiange 124, which is se-cured to the forward end wall of the rear :gearhousing 80, by means of screws 126.

The longitudinal gear shaft 104, adjacent to its forward end, extendsthrough a tubular bearing 128, secured through the hub `130 of .a fixedspider 132, `which extends across the interior of the forward gearhousing 112, midway between the ends thereof.

Within the rear gear housing 80 the longitudinal shaft 104 has fixedthereon a bevel pinion 134, which is spaced rearwardly from the spider132. On the forward end of the shaft 104 is fixed a rear cam wheel 136,which is formed, on its forward side, with four circumferentially spacedcams 138. The rcam wheel 136 faces a forward cam wheel 140, having fourcincumferentially spaced cams 142, on its rear side.

The forward cam wheel 140 is fixed on the rear end of a longitudinal4reciprocating shaft 144 which extends 'slidably and forwardly through abore 1416. The bore 146 is formed through the forward end wall 122 ofthe forward -gear housing 112 and through an axial externally threadedextension or stud 148 on the end wall 122. The forward end of thereciprocating shaft 144 is engaged in a socket 150 :in the rear end of acylindrical accessory mounting head 152, which has a tapered forward endportion 154. A cross pin 156 extends through the head 152 and the shaft144.

The head 152 has a diametrioal slot 158 opening to its forward end, atwhose rear end is a fixed diametrical pin 160. The shaft 144 is designedto receive a fiat terminal 162, on the rear end of a reciprocating holesaw blade 164, which is locked in place, by means of a removable crosspin 165, extending through the head 152, and through a hole 166,provided in the terminal 162, and engagement of la notch 167, in therear end of the terminal 162 with the fixed cross pin 160.

Alternately a hacksaw 168, shown in FIGURE 7, can be secured t-o thehead 152. The hiacksaw 168 comprises a substantially conventionalinverted U-shaped frame 170, carrying a hacksaw blade 170, which ismodified only to the extent that a rearward extension 172 is providedo-n the frame, which terminates in a terminal 162g, similar to theterminal 162 of the hole saw blade 164, :and adapted for reception inthe slot 158 of the head 152.

The head 152 has, lon its rear end, 'a reduced diameter washer 174 whichis normally spaced from the flat forward end of the stud 148. The stud148 has an external machine screw thread 178, on which is threaded afirst actuation control device 180 having, on its rear end, 1an enlargeddiameter annular handle 182, having a knurled rim 184. Circumposed onthe shaft 144, and compressed Ibetween the forward cam wheel 140, is acoil spring 186, which normally serves to bias the forward cam wheel 140into engagement with the rear cam wheel 136, whereby forward andrearward reciprocation of the forward cam wheel shaft 144, accompaniedby the saw blade 164, is produced, only when the actuation controldevice 180 is threaded rearwardly, as shown in IFIGURE 2, with the outerend of the actuation control device disengaged from the washer 174, andthe .spring 186 lallowed to expand.

In order to disengage the cam. wheels, it is necessary to thread theactuation control device 180 forwardly on the extension 148, away fromthe end wall 122 of the forward gear housing 112, and forcibly againstthe portion 174 of the head, so as to compress `the spring 186 and movethe shaft 144 and its cam wheel 140 forwardly relative to the rear camwheel 136. The actuation control device 180 is lockable, in itsretracted position by means of a set screw 188 threaded therethrough andi iadapted to engage the bottom of the screw thread 178 of the stud 148.

Engageable with the bevel pinion 134, at different times, are similarbevel pinions on aligned, di'ametrically opposed clutched shaftassemblies, which are identical in construction, and are distinguishedonly b/y the letters L and 2R, refe-rring to their leftand right-handlocations.

Each of the assemblies L and R comprises a shaft 1190 which slides androtates through the bore 192 which extends through the si-dewall 194 ofthe forward gear housing 1-12, behind the rear earn wheel 136, andthrough ia radial cylindrical extension or stud 196, on the sidewall194, which is provided with an external machine screw thread 198. Theshaft 190 has a bevel pinion 200, fixed on its inner end, for engagementwith the longitudinal bevel pinion 134, with a coil spring 202interposed between the pinion 200 an-d the sidewall 194. Gn the outerend of the shaft 190 is suitably fixed a preferably gear-type chuck 204,which is normally spaced outwardly from the threaded extension 196. Awasher 206 is circumposed on the shaft 190 between the chuck 204 and thestud 196.

Second `and third actuation control devices 208 are each threaded on theextension 196 an-d each has, on its outer end, a disc type knurledhandle 208. The control device 208 is :adapted to be locked, in selectedposition, by means of a set screw 210.

The control devices 208 of the assemblies L and R are 'adapted to beoperated in the same manner as the control device of the reciprocatingshaft assembly for engaging and disengaging their bevel pinions 200 withthe longitudinal gear shaft pinion 134.

Shown chrucked in the chuck 204 of the right-hand assembly R, is acircular saw l212, which can be replaced by a buffer 214, shown inFIGURE 9, both having shafts 216, adapted to be engaged in the chuck204.

Chucked in the left chuck of the left-hand assembly L, is la drill bit218, which can be replaced by any other desired accessory having ashaft.

FIGURE `8 shows a reciprocating sander 220 comprising a sander pliate222, having an offset longitudinal handle 224, which terminates in aflat terminal 16217, -simil'ar to the terminals of the hole saw blade164 and the frame of ythe hacksaw 168, whereby the reciprocating sander220 can be operatively secured to the head 152 on the reciprocatingshaft 144.

What is claimed is:

1. A combination power hand tool comprising a handle support, a motormounted on the support having `a motor shaft, a longitudinal shaftjournaled on the -support and operatively-connected to the motor shaft,said longitudinal shaft having a bevel pinion fixed thereon and .a rearcam wheel, a reciprocating shaft slidably-journaled on the support andhaving a forward cam wheel facing the rear cam wheel, a first actuationcontrol device movably-mounted on the support `and connected with thereciprocating shaft for engaging and disengaging the forward cam wheelwith the -rear cam wheel, and la first radial shaft slidably journaledon the support, said first radial shaft having a bevel pinion adaptedfor engagement with the bevel pinion of the longitudinal shaft, a secondactuation control device movably mounted on the support and connectedwith the radial shaft for engaging and disengaging its pinion with thepinion of the longitudinal shaft.

2. The combination of claim 1, wherein said support comprises a tubularcase terminating at its rear end in a longitudinal handle.

3. The combination of claim 1, wherein a first radial shaft is slid-ablyjournaled on the support, said first radial shaft having a bevel pinionadapted for engagement with the bevel pinion of the longitudinal shaft,second manual clutch means movably mounted on the support and connectedwith the radial shaft for engaging and disengaging its pinion with thepinion of the longitudinal shaft, said support comprising `a tubularcase having an open forward end, a web secured against said forward endcontaining a forward bearing, said ca-se containing a rear bearing atits rear end, said motor shaft being journaled in said rear bearing `andextending forwardly through said forward bearing, a rear gear housingengaging the forward side of the web, the motor shaft pinion beinglocated within said rear gear housing, a forward gear housing engagedwith the forward end of the rear gear housing, said cam wheels beinglocated within the forward gear housing, said forward gear housinghaving a forward end wall through which the reciprocating shaft slidesand turns, said forward gear housing having a side wall through whichthe radial shaft slides and turns.

4. The combination of claim 1 wherein a second radial shaft is alignedwith the first radial shaft and slidably journaled on the support, saidsecond radial shaft having a bevel pinion adapted for engagement withthe bevel pinion of the longitudinal shaft, and a third actuationcontrol device movably mounted on the support and connected to thesecond radial shaft for engaging and disengaging its bevel pinion withthe bevel pinion of the longitudinal shaft.

A5. The combination of claim `4 wherein said rst and second radialshafts have chucks fixed thereon, and different rotary accessoriesengaged in the chucks.

r6. The combination of claim 1, wherein said first actuation controldevice comprises an externally threaded stud projecting radially fromthe support, spring means interposed between the forward cam wheel andthe support, an accessory mounting head xed on the reciprocating shaftand adapted to be spaced outwardly from the stud, said first actuationmember being threaded on the stud and adapted at different times toengage the head and be disengaged from the head,

7. The combination of claim 6 wherein said head has a diametrical slotopening to its outer end, and a reciprocating accessory having a flatterminal engageable in the slot, and means for locking the terminal inthe slot.

8. The combination of claim 7 wherein said accessory is a 4hole saw.

9. The combination of claim 7 wherein said accessory is a hacksaw havinga frame, a rearward extention on the frame having a flat terminaladapted to be engaged in the slot.

10. The combination of claim 1 wherein said rst radial shaft has a chuckfixed thereon, and a rotary accessory engaged in said chuck.

11. The combination of claim 10 wherein said accessory is a drill bit.

12. The combination of claim 10 wherein said accessory is 4a rotary saw.

13. The combination of claim 10 wherein said accessory is a rotarybutter.

14. The combination of claim 1, wherein said support comprises a tubularcase terminating at its rear end in la longitudinal handle, a spider xedin the rear end of the case having an axial rear bearing, a web engagedwith the forward end of the case having a forward axial bearing, saidmotor shaft being journaled at its rear end in the rear bearing andextending forwardly through the forward bearing, a rear gear housingengaged with the forward side of the web, the bevel pinion of the motorshaft being located within the rear gear housing, and a forward gearhousing engaged with the forward end of the rear gear housing.

15. The combination of claim 14 wherein said cam wheels are locatedwithin the forward gear housing, said forward gear housing having aforward end wall through which the reciprocating shaft slides and turns.

16. In combination, a support having a wall, an externally threaded studon one side of the wall, said wall and said stud being formed with abore axial to the stud, a shaft journaled through said bore and havingan enlarged diameter member xed thereon at the side of the wall remotefrom the stud, spring means compressed between said member and saidwall, said shaft having an -accessory mounting head thereon spaced fromsaid stud, and a tubul-ar actuation control member threaded on the stud,said actuation control member being adapted to be rotated on the stud toengage said head and push the shaft in a direction to compress thespring means.

17. The combination of claim 16, wherein a relatively stationary shaftis journaled on the support and carries a second enlarged diametermember thereon opposed to the iirst mentioned enlarged diameter member,said .actuation control member being normally positionedon the stud outof contact with said head so as to relax the spring means to bias theiirst mentioned member into operative contact with said second member.

References Cited by the Examiner UNITED STATES PATENTS 813,396 2/ 1906Anker-Holth 192--95 2,303,565 12/ 1942 Luna 77-7 2,520,875 8/1950Birchmeier 144-1.7 2,526,976 10/ 1950 Smith 77-7 2,555,593 6/1951 Lee192-95 2,858,703 11/1958 Willcox 144-35.1 2,942,852 6/'1960 Muthmann173-123 3,003,165 10/ 1961 Charlet 77-25 FRED C. MATTE'RN, I R., PrimaryExaminer.

L. P. KESSLER, Assistant Examiner.

1. A COMBINATION POWER HAND TOOL COMPRISING A HANDLE SUPPORT, A MOTORMOUNTED ON THE SUPPORT HAVING A MOTOR SHAFT, A LONGITUDINAL SHAFTJOURNALED ON THE SUPPORT AND OPERATIVELY-CONNECTED TO THE MOTOR SHAFT,SAID LONGITUDINAL SHAFT HAVING A BEVEL PINION FIXED THEREON AND A REARCAM WHEEL, A RECIPROCATING SHAFT SLIDABLY-JOURNALED ON THE SUPPORT ANDHAVING A FORWARD CAM WHEEL FACING THE REAR CAM WHEEL, A FIRST ACTUATIONCONTROL DEVICE MOVABLY-MOUNTED ON THE SUPPORT AND CONNECTED WITH THERECIPROCATING SHAFT FOR ENGAGING SAID DISENGAGING THE FOWARD CAM WHEELWITH THE REAR CAM WHEEL, AND A FIRST RADIAL SHAFT SLIDABLY JOURNALED ONTHE SUPPORT, SAID FIRST RADIAL SHAFT HAVING A BEVEL PINION ADAPTED FORENGAGEMENT WITH THE BEVEL PINION OF THE LONGITUDINAL SHAFT, A SECONDACTUATION CONTROL DEVICE MOVABLY MOUNTED ON THE SUPPORT AND CONNECTEDWITH THE RADIAL SHAFT FOR ENGAGING AND DISENGAGING ITS PINION WITH THEPINION OF THE LONGITUDINAL SHAFT.